The only thing I can think of is that you can apply the layouts files manually. Obviously this can work for 1-2 files, but not for a lot. On the other hand, if you have lots of alternative routes in your project, that's probably a design issue, and you should ask How did I get here.

Maybe you can find a better file/path structure for the outcome that you envision. You didn't disclose information about the issue you want to solve by the route alias, only the means. A better question would be a more broad and verbose one. Maybe somebody can help you solve you issue in a way you didn't think of.